Michelia Nha Trang is a four star hotel, composed of 201 individually designed guestrooms, four meeting rooms and three in-house restaurants in Khanh Hoa Province. The hotel was awarded the second prize for the New Building in the Energy Efficient Building Contest organized by the Ministry of Industry and Trade in 2013. Many energy saving solutions have been applied such as a solar water heating system, energy efficient equipment that include lamps, air conditioning system and heatpumps.

Third Party Verified: No
Source of Information: Michelia Nha Trang Hotel
Methods of data collection: interviews with manager and data collection via email.

Windows
The window to wall ratio (WWR) is 40% which complies with the Energy Efficient Building Code – Building Envelope Guideline (EEBC) which regulates that WWR must be between 30% and 50% (EEBC 2013).

WallsColor
White walls allow a high solar reflection capacity which helps to reduce the heat gain of the building.Shading
A lot of trees are planted at the large balconies on the first and second floors. The aim is to reduce solar radiation to the walls, glass sections and main entrance below.

Logias have been designed for each guestroom to help reduce solar radiation by providing shading from the floor above and from vertical wall.

Over Thermal Transfer Value (OTTV) of the wall is calculated by ECC Ho Chi Minh at 45.2 W/m2, a reduction of 24.6% compared to the EEBC requirement (of 60W/m2).

Roof – TerraceShading
Solar water heating panels are used to collect solar energy but also help to reduce solar radiation on the roof surface.

Over Thermal Transfer Value (OTTV) of the roof is calculated by ECC Ho Chi Minh at 20.6 W/m2, a reduction of 17.6% compared to the EEBC requirement (of 25W/m2).

Daylighting

An skydome on the roof provides daylighting for the floor below

HVAC

1. Centralised air conditioning
Installation of a Variable Refrigerant Volume (VRV) AC system that includes:
– 11 outdoor units with a capacity of 44 kW each and COP of 3.42, a 20.4 % improvement compared to the EEBC requirement (of 2.84).
– 24 outdoor units with a capacity of 51 kW each and COP of 3.47, a 22.1% improvement compared to the EEBC requirement (of 2.84).

2. An air conditioning control system
Air conditioning system in guestrooms is turned on/off automatically by key cards
Automatic Door closers in all guestrooms help to avoid too much loss of cool air.

Lighting

Usage of energy efficient lamps
360 (3W and 50W) LED lamps are used in restaurants, meeting rooms and exterior areas.
1200 (14 W) Compact fluorescent light lamps are used in lobbies, guest rooms and public areas.
Lighting Power Density (LPD) is 2.8 W/m2, a reduction of 74.5% compared to the EEBC requirement (11 W/m2).

Building Loads

1. Water pumping system
Installation of VSDs for two (11 kW) water pumps to control operation more efficiently.

2. Hot water system
Installation of a solar water heater with a capacity of 30m3/day. It provides hot water for the kitchen room and all guestrooms. The rest of the areas are provided hot water by two oil boilers with a capacitiy of 800 l/h.
Installation of three (7.5 kW) heat pumps to potentially complement the solar water heater system, in case the weather does not allow to reach the hot water temperature setpoint.

Maintenance
Implementation of a preventative maintenance , repair and replacement plan for each family of equipment.
Qualified Technical Staff (18 members) in several fields such as electricity, electronics, plumbing,…
They perform 52,560 hours of maintenance works per year to ensure continuous operation for the hotel and provide a high level of customer services.